<!DOCTYPE html >
<html lang="en">

<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>更换单选按钮显示样式</title>
    <style>
        input[type='radio'].radio {
            opacity: 0;
            display: inline-block;
            height: 20px;
        }
        
        label.radio {
            background: url(./green.png) no-repeat;
            height: 20px;
            padding-left: 25px;
        }
        
        input[type='radio'].radio:checked+.radio {
            background: url(./round.png) no-repeat;
        }
    </style>
</head>

<body>
    <input type="radio" name="sex" id="a" value="X" class="radio">
    <label for="a" class="radio">我要保密</label><br>
    <input type="radio" name="sex" id="b" value="M" class="radio">
    <label for="b" class="radio">我是帅哥</label><br>
    <input type="radio" name="sex" id="c" value="F" class="radio">
    <label for="c" class="radio">我是美女</label><br>
</body>

</html>